| Adrian Thompson | Director | 20 Mar 2013 | 1 Apr 2016 | British | 64 years |
| Alan James Chaplin | Director | 20 Mar 2013 | 31 Mar 2016 | British | 65 years |
| Alan John Wilson | Director | 23 Jan 2008 | 30 Mar 2010 | British | 68 years |
| Alexander John Hynes | Director | 27 Aug 2013 | 31 Mar 2016 | British | 49 years |
| Amarjit Kang | Director | 7 Oct 2009 | 25 Feb 2010 | British | 58 years |
| Antoine Jan Macgiel Valk | Director | 6 Jan 2003 | 29 Jan 2007 | Dutch | 77 years |
| Brian Robert Burdsall | Director | 6 Jan 2003 | 13 Dec 2005 | British | 79 years |
| Chris Harris | Director | 20 Mar 2013 | 31 Mar 2016 | British | 52 years |
| Chris Manning | Director | 1 Jan 2010 | 5 Oct 2011 | British | 69 years |
| Christopher Kimberley | Director | 1 Oct 2004 | 4 Mar 2006 | British | 70 years |
| David Ronald Temple | Director | 29 Jan 2007 | 9 Sept 2009 | British | 68 years |
| David Stretch | Director | 15 May 2013 | 31 Dec 2016 | British | 58 years |
| Francesca Anne Todd | Secretary | 6 Jan 2003 | 31 May 2006 | British | - |
| Gary Shilston | Director | 6 Jan 2015 | 31 Mar 2017 | British | 59 years |
| Halco Management Limited | Corporate Director | 17 Dec 2002 | 6 Jan 2003 | United Kingdom | - |
| Halco Secretaries Limited | Corporate Secretary | 17 Dec 2002 | 31 Jan 2003 | United Kingdom | - |
| Heidi Mottram | Director | 13 Dec 2004 | 26 Feb 2010 | British | 61 years |
| Ian Bevan | Director | 1 Mar 2005 | 16 Dec 2013 | British | 68 years |
| Ian Bevan | Secretary | 12 Mar 2007 | 16 Dec 2013 | British | - |
| Ian Wilson Downie | Director | 6 Jan 2003 | 23 Sept 2004 | British | 71 years |
| Jamie Neil Peter Burles | Director | 8 Feb 2010 | 27 Nov 2013 | British | 54 years |
| Jan Chaudhry | Director | 21 Mar 2012 | 15 Jul 2015 | British | 59 years |
| Jayesh Pankhania | Director | 23 Jan 2008 | 19 Mar 2009 | British | 56 years |
| Jeroen Marcel Weimar | Director | 8 Mar 2010 | 21 Mar 2011 | Dutch | 57 years |
| Joanna Jean North | Director | 12 Dec 2006 | 5 Mar 2010 | British | 57 years |
| Joanne Roberts | Director | 19 Apr 2012 | 19 Mar 2014 | British | 57 years |
| John Hamilton Ainsworth Curley | Director | 3 Nov 2011 | 31 Oct 2012 | British | 72 years |
| John Michael Heron | Director | 31 Mar 2017 | 21 Sept 2023 | British | 54 years |
| John Michael Heron | Director | 21 Sept 2023 | 30 Nov 2023 | British | 54 years |
| Jonathan Christopher Stewart | Director | 21 Mar 2012 | 27 Nov 2013 | British | 56 years |
| Jonathan David Brown | Director | 21 Mar 2012 | 1 Nov 2013 | British | 62 years |
| Julian Edwards | Director | 10 Aug 2011 | 21 Sept 2023 | British | 57 years |
| Keith Frank Luck | Director | 19 Mar 2014 | 6 Jan 2015 | British | 66 years |
| Keith Frank Luck | Director | 20 May 2015 | 17 Nov 2017 | British | 66 years |
| Kevin Arthur Thomas | Director | 23 Dec 2013 | 22 Sept 2014 | British | 51 years |
| Lee Harvey Bartholomew | Director | 26 Nov 2004 | 18 Jan 2008 | British | 69 years |
| Lesley Anne Batty | Director | 16 Dec 2008 | 18 May 2011 | British | 65 years |
| Lester Mun Fook Loh | Director | 6 Jan 2003 | 21 Oct 2003 | British | 63 years |
| Malcolm Brown | Director | 18 Apr 2005 | 23 Jan 2008 | British | 59 years |
| Marcellinus Niggerbrugge | Director | 6 Jan 2003 | 23 Sept 2004 | Dutch | 76 years |
| Marie-antoinette Helene Wieman | Director | 3 Nov 2011 | 21 Mar 2012 | Nld Nederlandse | 54 years |
| Matthew Charles Brown | Director | 25 Feb 2010 | 5 Jan 2012 | British | 54 years |
| Nicholas James Forster Brown | Director | 4 Jan 2006 | 23 Jan 2008 | British | 67 years |
| Patricia Ann Riley | Director | 1 Mar 2005 | 1 Nov 2008 | British | 59 years |
| Paul Alan Gaskin | Director | 15 Apr 2009 | 3 Dec 2009 | British | 64 years |
| Peter Van Toor | Director | 6 Jan 2003 | 23 Sept 2004 | Dutch | 66 years |
| Peter Van Toor | Director | 24 Jan 2006 | 7 Sept 2011 | Dutch | 66 years |
| Philip Andrew Dennis | Director | 4 Dec 2003 | 4 Aug 2004 | British | 65 years |
| Richard Hilarius Maria Emmerink | Director | 23 Sept 2004 | 16 Dec 2008 | Dutch | 56 years |
| Rohan Jensen | Director | 4 Aug 2004 | 23 Sept 2004 | British | 75 years |
| Rudolf Franciscus Haket | Director | 1 Mar 2005 | 27 Jan 2010 | Dutch | 62 years |
| Serco Corporate Services Limited | Corporate Secretary | 31 May 2006 | 12 Mar 2007 | United Kingdom | - |
| Stephen Anthony Butcher | Director | 1 Mar 2010 | 20 Mar 2013 | British | 60 years |